a:8:{i:0;s:12:"book_type_id";i:1;s:4:"a_id";i:2;s:14:"book_type_name";i:3;s:16:"borrow_time_days";i:4;s:16:"book_type_intime";i:5;s:16:"book_type_status";s:3:"_pk";s:12:"book_type_id";s:5:"_type";a:6:{s:12:"book_type_id";s:7:"int(11)";s:4:"a_id";s:7:"int(11)";s:14:"book_type_name";s:12:"varchar(255)";s:16:"borrow_time_days";s:7:"int(11)";s:16:"book_type_intime";s:7:"int(11)";s:16:"book_type_status";s:7:"int(11)";}}